c - 为什么输出是 36 而不是 24？

Question

#include <stdio.h>
#include <stdlib.h>

int f(int a, int b) {
    int a1 = a, b1 = b;

    while (a1 != b1)
        if (a1 < b1) a1 += a;
        else b1 += b;

    return a1;
}

int main() {
    printf("%d\n", f(12, 18));
    return 0;
} 

嗨，我不明白为什么结果是 36，有人可以解释一下吗？

Answer 1

让我们逐步完成:

f(12, 18) -> a = 12, b = 18
int a1 = a, b1 = b; -> a1 = 12, b1 = 18
while (a1 != b1) -> not equal -> do the loop
if (a1 < b1) a1 += a; -> a1 = 24
while (a1 != b1) -> not equal -> do the loop
if (a1 < b1) ... else b1 += b; -> b1 = 36
while (a1 != b1) -> not equal -> do the loop
if (a1 < b1) a1 += a; -> a1 = 36
while (a1 != b1) -> equal -> end the loop
return a1 -> return 36